/Engine/Source/Runtime/GeometryCore/Public/QuadricError.h
A "Seam Quadric" is a quadric defined with respect to the plane passing through the edge p1-p0, but perpendicular to the adjacent face. On return the quadric has been weighted by the length of the (p1-p0).
namespace UE { namespace Geometry { template<typename RealType> [TQuadricError](API\Runtime\GeometryCore\TQuadricError)< RealType > UE::Geometry::CreateSeamQuadric ( const [TVector](API\Runtime\Core\Math\TVector)< RealType > & p0, const [TVector](API\Runtime\Core\Math\TVector)< RealType > & p1, const [TVector](API\Runtime\Core\Math\TVector)< RealType > & AdjFaceNormal ) } }